需要的jar包
　　使用ojdbc6.jar
　　在/META-INF/MANIFEST.MF里可以看到Specification-Version: 4.0
　　建表
create sequence seq_blobmodel_id start with 1 increment by 1 nocache;
create table blobmodel
(
blobid number(10) primary key not null，
image blob
);
　　将文件写入数据库
1 /**
2      * 将图片文件存入数据库
3      * @throws SQLException
4      * @throws IOException
5      */
6     public int writeBlob(String path) throws SQLException， IOException{
7         int result = 0;
8         String sql = "insert into blobmodel(blobid，image) values(seq_blobmodel_id.nextval，?)";
9         //1.创建Blob
10         Blob image = DBHelper.getConnection().createBlob();
11         //2.将流放入blob
12         OutputStream out = image.setBinaryStream(1);
13         //3.读取图片，并写入输出流
14         FileInputStream fis = new FileInputStream(path);
15         byte []buf = new byte[1024];
16         int len = 0;
17         while((len=fis.read(buf))!=-1){
18             out.write(buf， 0， len);
19         }
20         result = DBHelper.executeUpdate2(sql， new Object[]{image});//自己简单封装了jdbc操作
21
22         fis.close();
23         out.close();
24         return result;
25     }
　　将文件从数据库中读出
/**
* 将数据库中的图片文件读出来
* @throws SQLException
* @throws IOException
*/
public void readBlob() throws SQLException， IOException{
String sql = "select image from blobmodel where blobid=?";
DBHelper.getConnection();//
ResultSet rs = DBHelper.executeQuery(sql， new Object[]{1});
while(rs.next()){
Blob image = rs.getBlob(1);
InputStream is = image.getBinaryStream();
BufferedInputStream bis = new BufferedInputStream(is);
String path = "img/"+new Date().getTime()+".jpg";//指定输出的目录为项目下的img文件夹
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(path));
byte []buf = new byte[1024];
int len = 0;
while((len=bis.read(buf))!=-1){
bos.write(buf，0，len);
}
bos.close();
bis.close();
}
}